Clean tests - Better test

bettter-test.js

test("When no credit, the declined transfer does not appear in sender history", () => {
      // Arrange
      const transferRequest = testHelpers.factorMoneyTransfer({
        sender: { credit: 50 },
        transferAmount: 100,
      });
      const transferServiceUnderTest = new TransferService({ creditPolicy: "NoCredit" });

      // Act
      transferServiceUnderTest.transfer(transferRequest);

      // Assert
      const senderTransfersHistory = transferServiceUnderTest.getTransfers(transferRequest.sender.name);
      expect(senderTransfersHistory).not.toContain(transferRequest);
    });